<!DOCTYPE html>
<html>

<head>
    <meta charset="utf-8">
    <title>Hello World</title>
    <link rel="stylesheet" href="step3/CSS/style.css">
</head>

<body>
    <div>
        <h1>CSS让网页样式更丰富</h1>
        <p>这是一个段落</p>
    </div>
</body>
<script>
body {
     margin-right: 200px;
     /* ********** BEGIN ********** */
     /*设置背景图片*/
    background:url(https://educoder.net/api/attachments/211104) no-repeat fixed right top;
     /* ********** END ********** */
 }

 div {
     width: 90%;
     height: 100%
     margin: auto;
 }
</script>

</html>